Sensor Data shows the readings and status of standard and optional sensors.
Figure 93 Sensor data screen, page 1
U301 Sensor A: T / H—Shows the calibrated Sensor A temperature (left hand value) and humidity
(right hand value) if the optional reference sensor is connected to the Liebert iCOM controller area network (CAN) bus. A reference sensor can be connected to any type of Liebert iCOM unit. Sensor A is selected by setting the DIP switches on the temperature and humidity board. Refer to 4.3.2 - DIP Switch Settings.
U302 Sensor B: T1 / T2 / H—Shows the calibrated Sensor B temperature (left hand value), second
temperature reading in the if sensor B is a 2T, and humidity (right hand value) if sensor B is a T/H sensor. Sensor B is an optional reference sensor connected to the Liebert iCOM controller area network (CAN) bus. A reference sensor can be connected to any type of Liebert iCOM unit. Sensor B is selected by setting the DIP switches on the temperature and humidity board. Refer to 4.3.2 - DIP Switch Settings.
U303 Sensor C: T1 / T2 / H—Shows the calibrated Sensor C temperature (left hand value), a second
temperature reading if sensor C is a 2T (middle), and humidity (right hand value) if sensor C is a T/H sensor. Sensor C is an optional reference sensor connected to the Liebert iCOM controller area network (CAN) bus. Sensor C is selected by setting the DIP switches on the temperature and humidity board. Refer to 4.3.2 - DIP Switch Settings. A reference sensor 'C' can be connected to any type of Liebert iCOM unit unless the unit is equipped with an air side economizer. When the unit has an air side economizer, this parameter represents the outside air temperature and humidity. See the description below for more details.
U303 Outdoor Temp / Hum—Reads the calibrated outdoor temperature (left hand value) and
humidity (right hand value) for air side economizer units. These readings are used to determine air side economizer eligibility. It is determined by comparing the temp between the room and outdoor air temperature.
U304 FC Fluid Temperature—Displays the calibrated temperature of the incoming water on units
U305 FC Status / Amb Temp—Displays the operating status of air side economizer (left hand value)
and displays the current outside air temperature (right hand value). The operating status values include: Off, Start and On.
U305 Freecooling Status—Displays the operating status of free cool or dual cool economizer (left
hand value) and displays the current outside air temperature (right hand value). The operating status values include: Off, Start and On.
U306 CW Temp In / Out—Displays the calibrated chilled water inlet (left hand value) and outlet
(right hand value) temperature. If two chilled water inlet/outlet sensors are connected, the description will change to 'CW Temp C1 In / Out.'
U307 CW Flow Circuit 1—Displays the calibrated fluid flow through the unit in gallons per minute
or liters per minute. The description show will change depending on the unit type installed. Single Circuit chilled water units will read 'CW Flow', Dual Chilled water circuit units will read 'CW Flow Circuit 1', Free cooling or dual cool unit will display 'FC Fluid Flow' and DX units with water/glycol cooled heat exchangers will read “Glycol Flow.”
U308 CW Temp C2 In / Out—Displays the calibrated chilled water inlet (left hand value) and outlet
(right hand value) temperature of the second circuit on a dual chilled water unit.
U309 CW Flow Circuit 2—Displays the calibrated fluid flow through the unit in gallons per minute
or liters per minute.
U310 Total Cooling Load kW—Displays the calculated chilled water cooling load based on the
temperature difference from supply to return and the fluid flow rate. If the display is set to read KBtuH, the line description will update to “Total Cooling Load KBtuH.”
U311 Static Pressure inWC / Pa—Displays the calibrated static pressure in inWC (left hand value)
and Pa (right hand value).
U312 SYS Static Pressure inWC / Pa—Displays the calibrated static pressure inWC (left hand
value) and Pa (right hand value) where multiple static pressure sensor are shared across the iCOM U2U network. The reading displayed will be an average or minimum pressure of all connected units based on S197 SP Teamwork / Network mode setting.
U31A Calculated Airflow—Shows the calculated airflow based on an installed differential pressure
Figure 94 Sensor data screen, page 2 (return only)
U313 Daily High Temperature—The highest recorded temperature from the temperature
controlling sensor between the hours of 12:00 a.m. to 11:59 p.m.
U314 Daily Low Temperature—The lowest recorded temperature from the temperature
controlling sensor between the hours of 12:00 a.m. to 11:59 p.m.
U315 Daily High Humidity—The highest recorded humidity from the temperature controlling
sensor between the hours of 12:00 a.m. to 11:59 p.m.
U316 Daily Low Humidity—The lowest recorded humidity from the temperature controlling sensor
between the hours of 12:00 a.m. to 11:59 p.m.
U317 Daily High Dew Point—The highest recorded dew point from the temperature controlling
sensor between the hours of 12:00 a.m. to 11:59 p.m.
U318 Daily Low Dew Point—The lowest recorded dew point from the temperature controlling
sensor between the hours of 12:00 a.m. to 11:59 p.m.
U320 Return THB T/H/DP—Displays the actual temperature relative humidity and calculated dew
point at the return of the unit.
U321 Sensor A T/H/DP—Displays the actual temperature relative humidity and calculated dew
Figure 95 Sensor data screen, page 3
U325 Remote / Auxiliary Sensors - Unit Information—read only text describing screen features. U326 REM Sensors set to Control—Read-only parameter that shows the number of sensor set to
control (left hand value) and the sensor control type used (right hand value). If the sensors are used for reference only, the right hand value will display None. Otherwise the right hand value will display the sensor control mode such as Cool, Fan or Cool + Fan.
U327 Unit Aggregation Method—Read=only parameter that describes the sensor level control or
aggregation method used for control. The left hand value will display Maximum or Average of based on the Service Menus>Remote SB03 programming. If set to Average, a number will appear to the right. This number represents the highest number of remote sensors used for calculating the average temperature. This number is also based on the programming in Service Menus>Remote SB0.3.
U328 Remote Sensor 1/2—Displays the actual remote sensor reading for each remote sensor. The
actual value reported here depends on how the sensor is set up. If the sensor is set to Average, then an average of the two temperature readings per sensor will be shown. If the sensor is set to Maximum, then the maximum value will be shown.
U329 Remote Sensor 3/4—Same as Remote Sensor 1/2 U330 Remote Sensor 5/6—Same as Remote Sensor 1/2 U331 Remote Sensor 7/8—Same as Remote Sensor 1/2 U332 Remote Sensor 9/10—Same as Remote Sensor 1/2
U333 Remote Sensor Unit Average—Displays the average remote sensor temperature taken from
the total number of remote sensor readings above.
U334 Remote Sensor Unit Maximum—Displays the maximum remote sensor temperature taken
from the remote sensor readings above.
U336 Unit Aggregated Ctrl Temperature—Displays the remote sensor temperature control
Figure 96 Sensor data screen, page 4
U337 Remote / Auxiliary Sensors - System Information—Read-only text describing screen
features.
U338 Teamwork Mode—Read-only parameter describes what U2U teamwork mode the unit is
operating in.
U339 Teamwork Aggregation Method—Read-only parameter is viewable only in Teamwork 1 and
3 with temperature or fan control sensor set to Remote. This parameter describes if the teamwork control is based on the average or maximum sensor readings in the group. If programmed to Average, the parameter will also display how many units are calculated in the average. Only the highest sensor readings will be used for the averaging.
U341 System Remote Sensor Average—Read-only parameter is viewable only in Teamwork 1 and
3 with temperature or fan control sensor set to Remote. This parameter displays the average remote sensor reading of all connected sensors.
U342 System Remote Sensor Maximum—Read-only parameter is viewable only in Teamwork 1
and 3 with temperature or fan control sensor set to Remote. This parameter displays the average remote sensor reading.
U344 Aux Air Weight / Temp—Read-only parameter is viewable only when the unit is connected to
wireless sensors, the unit is in Teamwork 1 or 3, temperature or fan control sensor set to Remote to view this parameter and teamwork is based on Average control. This parameter displays the weight applied to the wireless control (left hand value) and actual wireless sensor reading (right hand value). The left hand value represents the amount of influence the actual wireless sensor reading (right hand value) has relative other remote sensors for controlling component operation. The actual wireless sensor reading (right hand value) is the maximum or average wireless sensor reading transmitted from the auxiliary proxy or Liebert SiteLink®.
U345 Aux Air Mode / Temp—Read-only parameter is viewable only when the unit is connected to
wireless sensors, the unit is in Teamwork 1 or 3, temperature or the fan control sensor set to Remote and teamwork is based on Maximum. This parameter describes how the wireless sensors are used in the teamwork calculation (left hand value) and what the actual wireless sensor reading (right hand value). Three possible statuses may be shown as the left hand value: EXCL, INCL and ONLY. EXCL indicates that the wireless sensor value is not used for determining the unit fan or cooling operation. INCL indicates the wireless sensor value is considered for controlling fan or cooling operation. ONLY indicates the wireless sensor value is used for determining fan or cooling operation. The actual wireless sensor reading (right hand value) is the maximum or average wireless sensor reading transmitted from the auxiliary proxy or Liebert SiteLink.
U348 System Aggregated Ctrl Temperature—Read-only parameter is control temperature for
Figure 97 Sensor data screen, page 5
These parameters show the analog input configured device and the value from the device that is connected to the Liebert iCOM control. Refer to the Figure 167 through 172 for a list of analog input devices. The analog input device is setup in the Service menu and could consist of: Air Pressure, Pressure, Temperature or Percent.
Active Alarms
Active Alarms—Permits viewing all current, active alarms.